Dear Attorney Zhang,
I appreciate all your assistance. Your staff's capability was excellent.
I am really willing to refer you to somebody else.
It is surely my legal and moral responsibility to pay for all remaining as you pointed out on the agreement.
But I am afraid to ask you some favor on this.
I am heavily affected by the credit crunch these days.
Can I pay the remaining $2500 on the basis of installment plan, for example, $500*5 months?
I will do my best to pay in full asap. I am so sorry to ask you this.
Thank you and have a good day.